Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/11361#issuecomment-188629681
Can you take a look why would 2 queries take 13 mins?
```
EXPLAIN
SELECT count(1) FROM (
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src) src;
SELECT count(1) FROM (
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src UNION ALL
SELECT key, value FROM src) src;
```
When I was running this, this was running in parser forever.
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